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release-notes: Add v0.2.0 notes

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Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
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# v0.2.0
This release has been tracked through the [0.2.0 project](https://github.com/intel/cloud-hypervisor/projects/2).
Highlights for `cloud-hypervisor` version 0.2.0 include:
### Network device offloading
As part of our general effort to offload paravirtualized I/O to external
processes, we added support for
[vhost-user-net](https://access.redhat.com/solutions/3394851) backends. This
enables `cloud-hypervisor` users to plug a `vhost-user` based networking device
(e.g. [DPDK](https://dpdk.org)) into the VMM as their virtio network backend.
### Minimal hardware-reduced ACPI
In order to properly implement and guest reset and shutdown, we implemented
a minimal version of the hardware-reduced ACPI specification. Together with
a tiny I/O port based ACPI device, this allows `cloud-hypervisor` guests to
cleanly reboot and shutdown.
The ACPI implementation is a `cloud-hypervisor` build time option that is
enabled by default.
### Debug I/O port
Based on the Firecracker idea of using a dedicated I/O port to measure guest
boot times, we added support for logging guest events through the
[0x80](https://www.intel.com/content/www/us/en/support/articles/000005500/boards-and-kits.html)
PC debug port. This allows, among other things, for granular guest boot time
measurements. See our [debug port documentation](https://github.com/intel/cloud-hypervisor/blob/master/docs/debug-port.md)
for more details.
### Improved direct device assignment
We fixed a major performance issue with our initial VFIO implementation: When
enabling VT-d through the KVM and VFIO APIs, our guest memory writes and reads
were (in many cases) not cached. After correctly tagging the guest memory from
`cloud-hypervisor` we're now able to reach the expected performance from
directly assigned devices.
### Improved shared filesystem
We added shared memory region with [DAX](https://www.kernel.org/doc/Documentation/filesystems/dax.txt)
support to our [virtio-fs](https://virtio-fs.gitlab.io/) shared file system.
This provides better shared filesystem IO performance with a smaller guest
memory footprint.
### Ubuntu bionic based CI
Thanks to our [simple KVM firmware](https://github.com/intel/rust-hypervisor-firmware)
improvements, we are now able to boot Ubuntu bionic images. We added those to
our CI pipeline.
# v0.1.0
This release has been tracked through the [0.1.0 project](https://github.com/intel/cloud-hypervisor/projects/1).